Is it possible to remove the capabillty "create new Dashboard" or "clone a Dashboard" even if it is private?
here are a list of capabilities:
http://docs.splunk.com/Documentation/Splunk/6.6.0/Admin/authorizeconf
i'm not sure you can just take that button away using capabilities.
check out this answer
https://answers.splunk.com/answers/345407/hide-create-new-dashboard-button.html
Know you the matching capability?